Abstract
The landslides at Rissa in 1978, and more recently at the Skjeggestad bridge in Norway, are devastating reminders of the potential threats related to quick clays. For a geotechnical engineering project it is hence important to determine if there is sensitive clay present and to clarify the extent of the quick clay deposit. Integration of geophysical and geotechnical methods has become more common in ground investigations nowadays, particularly in larger projects. In such integrated measurements, geotechnical engineers and geophysicists can cooperate, and by joint knowledge decide where geotechnical soundings, in situ tests and sampling should be located with optimal cost-efficiency. This paper describes how various investigation methods may be combined to achieve a successful strategy for detecting deposits of quick and sensitive clays. The methods presented herein include conventional soundings, CPTU and field vane test (FVT), supplemented by geophysical methods such as CPTU with resistivity measurements (R-CPTU), Electrical Resistivity Tomography (ERT) and Airborne Electromagnetic Measurements (AEM).
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References
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Acknowledgements
The partners in the NIFS project are greatly acknowledged for the financial support and good discussions throughout the study. The board of the Norwegian Geotechnical Society (NGF) are acknowledged for financial support for development of the summary report. The authors want to extend thanks to Rambøll, Multiconsult, NGI, Statens vegvesen (NPRA) and NGU for supplying test data in the study. The authors also wish to express their gratitude to the reviewer Dr. Denis Demers for his valuable comments.
This paper was written by Rolf Sandven before he all too early passed away in October 2016. The authors hope that his legacy and his focus on knowledge and quality in laboratory and field investigations will live on.
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Sandven, R., Gylland, A.S., Montafia, A., Pfaffhuber, A.A., Kåsin, K., Long, M. (2017). Future Strategy for Soil Investigations in Quick Clay Areas. In: Thakur, V., L'Heureux, JS., Locat, A. (eds) Landslides in Sensitive Clays. Advances in Natural and Technological Hazards Research, vol 46. Springer, Cham. https://doi.org/10.1007/978-3-319-56487-6_44
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DOI: https://doi.org/10.1007/978-3-319-56487-6_44
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